Describing a Shear requires 2 things;
a) the invariant line, and
b) the shear factor.
Sorry, this page requires a Java-compatible web browser.

Drag the points k, A, B or C and observe 

1. how the image of A, B and C changes under different shear factors?
2. how the image of A, B and C changes as A, B and C moves away from the invariant line?
3. what happens if A, B or C is on the invariant line? 

4. how shear factor is calculated?   

5. area of both object and image.